Waste rubber particles for asphalt and preparation method thereof

Abstract

The invention discloses waste rubber particles for asphalt. The waste rubber particles for asphalt are characterized in that the particle diameter is 2 to 8mm; the waste rubber particles for asphalt comprise the following components in percentage by weight: 90 to 96 percent of waste automobile tire particles, 3 to 8 percent of modified filler and 1 to 3 percent of inorganic filler, wherein the particle diameter of the waste automobile tire particles is greater than or equal to 20 meshes; the modified filler is polypropylene, polyethylene or / and polystyrene; the inorganic filler is diatomite, hargil or / and attapulgite; and the particle diameter of the inorganic filler is greater than or equal to 200 meshes. The invention relates to a preparation method of the waste rubber particles for asphalt. The particles have the advantages of low dissolving temperature in the asphalt, short dissolving time and difficult production of sulfur-containing toxic gas during dissolving and mixing.

Description

technical field [0001] The invention relates to a waste rubber granule, in particular to a waste rubber granule for asphalt and a preparation method thereof. Background technique [0002] At present, waste rubber particles will be added in the production process of modified asphalt and rubber asphalt, so as to improve the dual properties of asphalt quality and recycling, so the research and invention of waste rubber particles. The original modified asphalt and rubber asphalt are modified asphalt products and rubber asphalt formed by adding waste tire rubber powder directly into high-temperature base asphalt, stirring and dissolving at high temperature, and dispersing waste rubber powder in base asphalt. When the waste rubber powder is added to the asphalt, the asphalt needs to be heated to 210-220°C, and the dissolution time of the waste rubber powder in the asphalt should be more than 5 hours. toxic gas; because waste rubber powder and base asphalt are a physical mixing pr...

AI Technical Summary

Problems solved by technology

The original modified asphalt and rubber asphalt are modified asphalt products and rubber asphalt formed by adding waste tire rubber powder directly into high-temperature base asphalt, stirring and dissolving at high temperature, and dispersing waste rubber powder in base asphalt. When the waste rubber powder is added to the asphalt, the asphalt needs to be heated to 210-220°C, and the dissolution time of the waste rubber powder in the asphalt should be more than 5 hours. toxic gas; because waste rubber powder and base asphalt are a physical mixing process, waste rubber powder and base asphalt have not reached the chemical peptization state, and when the stirring is stopped, the waste rubber powder and base asphalt that make up rubber modified asphalt will be Layered phase separation occurs (rubber powder segregated and precipitated), making the modified asphalt unusable; therefore, the rubber powder modified asphalt product must be continuously stirred to prevent the layered segregation phenomenon of rubber powder modified asphalt from affecting the use; this method Although it is effective, it cannot fundamentally solve the problem. If there is an equipment failure or a power outage, and the agitator on the asphalt tank on the construction site cannot work, the waste rubber powder modified asphalt product in the asphalt tank will undergo stratification, segregation and precipitation. It cannot be used, and the waste rubber powder separated and deposited at the bottom of the tank will also block the pipeline, which will cause the entire asphalt mixture to fail and shut down the mixing system; if the waste rubber-modified asphalt produced on the day is used excessively, it will consume a lot of electricity for continuous mixing ; There are a large number of insoluble waste rubber particles in traditional rubber-modified asphalt. When making asphalt mixture with traditional waste rubber-modified The proportion of asphalt used is very large, resulting in the cost of the pavement being higher than the cost of using expensive SBS modified asphalt; when traditional rubber modified asphalt is stirred and stored at high temperature, it is prone to degradation (expressed as a sudden drop in viscosity) ) without using